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authorJuan J. Martinez <jjm@usebox.net>2023-07-10 12:24:02 +0100
committerJuan J. Martinez <jjm@usebox.net>2023-07-10 12:24:02 +0100
commit3cbf9660974ead3fd8eb2b7398af293576896ec9 (patch)
treef103f300adebc25c6d43ed620dbba67185907a74 /src
parentfcde38e508cd381ad17e0f73946fa551ac683c81 (diff)
downloadgold-mine-run-3cbf9660974ead3fd8eb2b7398af293576896ec9.tar.gz
gold-mine-run-3cbf9660974ead3fd8eb2b7398af293576896ec9.zip
Further optimisation
Diffstat (limited to 'src')
-rw-r--r--src/vga.c93
1 files changed, 54 insertions, 39 deletions
diff --git a/src/vga.c b/src/vga.c
index a82fca9..1dc77db 100644
--- a/src/vga.c
+++ b/src/vga.c
@@ -122,58 +122,73 @@ void blit(const uint8_t *sprite, const Rect *dst)
void blit_c(const uint8_t *sprite, const Rect *dst, uint8_t c)
{
- uint8_t b;
uint8_t *dtarget = target + dst->x + dst->y * 320;
- const uint16_t inc = 320 - dst->w;
-
- for (uint16_t j = dst->h; j > 0; j--)
- {
- for (uint16_t i = dst->w; i > 0; i--)
- {
- b = *sprite++;
- /* transparent */
- if (b == TRANSPARENT)
- {
- dtarget++;
- continue;
- }
+ asm volatile (
+ "movl $320, %%ebp\n\t"
+ "subl %%ecx, %%ebp\n\t"
+ "blit_c_w:\n\t"
+ "movl %%ecx, %%eax\n\t"
+ "blit_c_w_loop:\n\t"
+ "movb (%%esi), %%ah\n\t"
+ "cmpb $%p5, %%ah\n\t"
+ "je blitrc_tr\n\t"
+ "orb %%ah, %%ah\n\t"
+ "je blit_c_store\n\t"
+ "movb %%dl, %%ah\n\t"
+ "blit_c_store:\n\t"
+ "movb %%ah, (%%edi)\n\t"
+ "blit_c_tr:\n\t"
+ "incl %%esi\n\t"
+ "incl %%edi\n\t"
+ "decb %%al\n\t"
+ "jne blit_c_w_loop\n\t"
+ "addl %%ebp, %%edi\n\t"
+ "decl %%ebx\n\t"
+ "jne blit_c_w\n\t"
+ : /*no output */
+ : "S" (sprite), "D" (dtarget),
+ "b" ((uint32_t)dst->h), "d" ((uint32_t)c),
+ "c" ((uint32_t)dst->w), "i" (TRANSPARENT)
+ : "eax", "ebp"
+ );
- *dtarget++ = b ? c : b;
- }
- dtarget += inc;
- }
}
void blitrc(const uint8_t *sprite, const Rect *src, const Rect *dst)
{
- uint8_t b;
uint8_t *dtarget = target + dst->x + dst->y * 320;
- const uint16_t inc1 = src->w - dst->w;
- const uint16_t inc2 = 320 - dst->w;
sprite += src->x + src->y * src->w;
- for (uint16_t j = dst->h; j > 0; j--)
- {
- for (uint16_t i = dst->w; i > 0; i--)
- {
- b = *sprite++;
-
- /* transparent */
- if (b == TRANSPARENT)
- {
- dtarget++;
- continue;
- }
-
- *dtarget++ = b;
- }
- sprite += inc1;
- dtarget += inc2;
- }
+ asm volatile (
+ "movl $320, %%ebp\n\t"
+ "subl %%ecx, %%ebp\n\t"
+ "blitrc_w:\n\t"
+ "movl %%ecx, %%eax\n\t"
+ "blitrc_w_loop:\n\t"
+ "movb (%%esi), %%ah\n\t"
+ "cmpb $%p5, %%ah\n\t"
+ "je blitrc_tr\n\t"
+ "movb %%ah, (%%edi)\n\t"
+ "blitrc_tr:\n\t"
+ "incl %%esi\n\t"
+ "incl %%edi\n\t"
+ "decb %%al\n\t"
+ "jne blitrc_w_loop\n\t"
+ "addl %%edx, %%esi\n\t"
+ "addl %%ebp, %%edi\n\t"
+ "decl %%ebx\n\t"
+ "jne blitrc_w\n\t"
+ : /*no output */
+ : "S" (sprite), "D" (dtarget),
+ "b" ((uint32_t)dst->h), "d" ((uint32_t)(src->w - dst->w)),
+ "c" ((uint32_t)dst->w), "i" (TRANSPARENT)
+ : "eax", "ebp"
+ );
}
+
void blit_erase(uint8_t c)
{
memset(target, c, 320 * 200);